Class: AstroSubframeOrganizer::FilenameParsers::FitsHeaderParser

Inherits:
AstroSubframeOrganizer::FilenameParser show all
Includes:
Logging, Utils::ExposureFormat
Defined in:
lib/astro_subframe_organizer/filename_parsers/fits_header_parser.rb

Overview

Parser to generate FileMetadata based on FITS headers and filename patterns.

Instance Attribute Summary

Attributes inherited from AstroSubframeOrganizer::FilenameParser

#filename, #path, #result

Instance Method Summary collapse

Methods included from Utils::ExposureFormat

#format_exposure

Methods included from Logging

#logger

Methods inherited from AstroSubframeOrganizer::FilenameParser

for_file, #initialize

Constructor Details

This class inherits a constructor from AstroSubframeOrganizer::FilenameParser

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/astro_subframe_organizer/filename_parsers/fits_header_parser.rb', line 16

def [](key)
  headers[key]
end

#ccd_temperature ⇒ Object 



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# File 'lib/astro_subframe_organizer/filename_parsers/fits_header_parser.rb', line 81

def ccd_temperature
  header(:temperature)
end

#header(key) ⇒ Object 



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# File 'lib/astro_subframe_organizer/filename_parsers/fits_header_parser.rb', line 72

def header(key)
  keys = Config.fits_header_mappings[key.to_s] || []
  keys.lazy.filter_map { |k| headers[k] }.first
end

#headers ⇒ Object 



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# File 'lib/astro_subframe_organizer/filename_parsers/fits_header_parser.rb', line 12

def headers
  @headers ||= load_headers(path)
end

#image_type ⇒ Object 



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# File 'lib/astro_subframe_organizer/filename_parsers/fits_header_parser.rb', line 64

def image_type
  header(:type)
end

#light_frame? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/astro_subframe_organizer/filename_parsers/fits_header_parser.rb', line 68

def light_frame?
  image_type == Astrophoto::LIGHT
end

#mosaic_pane ⇒ Object 



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# File 'lib/astro_subframe_organizer/filename_parsers/fits_header_parser.rb', line 58

def mosaic_pane
  # Not available in FITS headers for ASIAIR mosaic frames.
  # Must be parsed from filename pattern: TARGET_ROW-COL_
  parsed_from_filename[:mosaic_pane]
end

#parse ⇒ Object

rubocop:disable Metrics/AbcSize,Metrics/MethodLength



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# File 'lib/astro_subframe_organizer/filename_parsers/fits_header_parser.rb', line 20

def parse # rubocop:disable Metrics/AbcSize,Metrics/MethodLength
  result = {
    file_format: :fits,
    path: @path,
    filename: @filename,
  }

  # If the file is already organized somewhere, get the information from its path.
  metadata_from_path = extract_metadata_from_path
  result[:telescope] = metadata_from_path[:telescope] || header(:telescope)
  result[:filter]    = metadata_from_path[:filter]    || header(:filter)
  result[:dark_flat] = metadata_from_path[:dark_flat]

  result[:type]        = image_type
  result[:target]      = target if light_frame?
  result[:exposure]    = format_exposure(header(:exposure))
  result[:bin]         = header(:binning)
  result[:camera]      = header(:camera)
  result[:gain]        = header(:gain)
  result[:iso]         = header(:iso)
  result[:created_at]  = parse_date(header(:date_obs))
  result[:ccd_temp]    = format_temp(ccd_temperature)
  result[:image_index] = parse_parts(extract_base_name).last
  result[:rotation]    = rotation_angle
  result[:mosaic_pane] = mosaic_pane

  FileMetadata.from_parsed_data(result)
rescue StandardError => e
  logger.error "Failed to parse FITS headers for #{@filename}: #{e.message}"
  FileMetadata.from_parsed_data(file_format: :fits, path: @path, filename: @filename)
ensure
  logger.debug result
end

#rotation_angle ⇒ Object 



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# File 'lib/astro_subframe_organizer/filename_parsers/fits_header_parser.rb', line 77

def rotation_angle
  header(:rotation)
end

#target ⇒ Object 



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# File 'lib/astro_subframe_organizer/filename_parsers/fits_header_parser.rb', line 54

def target
  header(:target) || parsed_from_filename[:target]
end